___________ is caused by congenital anomalies, IUGR, post term preg, ruptured membranes (persists, poor prognosis), iatrogenic causes, renal issues is the most common cause.
-skeletal abnormalities (talipes)
-IUGR (fetal hypoxemia- available blood gets shunted to brain, bypassing kidneys)
-can cause fetal demise
-poor acoustic window for visualization
-always assess kidneys when oligo is present, unless the cause is PROM